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System and method for varying response amplitude of radio transponders

  • US 7,791,453 B2
  • Filed: 11/21/2006
  • Issued: 09/07/2010
  • Est. Priority Date: 11/21/2006
  • Status: Expired due to Fees
First Claim
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1. A method for locating an object using a radio frequency identification system, the method comprising:

  • communicating at least one interrogation signal to a chip-based radio frequency identification tag comprising an antenna and a chip in communication with the antenna;

    transmitting at least one response signal from the radio frequency identification tag to each one of a plurality of radio frequency identification readers;

    reducing an effective reading range of the transmitted response signal over time by controlling the amplitude of backwater radiation that the radio frequency identification tag, uses to communicate with the radio frequency identification readers;

    identifying a minimum effective reading range of the transmitted response signal for each one of the plurality of radio frequency identification readers; and

    determining a location of the radio frequency identification tag based upon the identified minimum effective reading ranges.

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